Add hover background to wiki list page (#27507)

Add hover background to wiki list page (#27507)

This patch adds a hover background for the wiki row in wiki list page,
which make its behavior more close to repo's file list page.

This patch also make the wiki-git-entry visible on the row is hovered
instead of the cel, so users won't be confused since the 'grid' is not
visible from the web page.

After the patch: (when the wiki named 'Home' is hovered)

![image](https://github.com/go-gitea/gitea/assets/10095765/f6c67c41-ad54-4ce4-a3b1-8c7551396ce0)